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The horizontal fraction bar was introduced by the Arabs.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.